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Technical Bulletin
A604 (41TE) Transmission - Transmission Not Shifting Properly

Any vehicle equipped with an A604 (41TE) transaxle Pre-1994

Issue:

You’ve just installed your remanufactured transmission and notice the transmission is not shifting properly. Examples would be lost of high gear, flared upshifts, harsh upshifts, etc.

Resolution:

Whenever a battery is disconnected or loss of voltage supply to transaxle control module (TCM) has occurred such as in a transmission installation, the vehicle stored shift strategy will be erased causing poor shift quality or loss of gears.

Step 1: Warm transaxle to normal operating temperature by allowing the engine to idle for proper time depending on ambient temperature.

Ambient Temperature	Engine Idle Time (Minutes)
0°F	8
20°F	6
40°F	4
60°F	2
80°F	0

Step 2: To set transaxle upshift learn procedure, operate vehicle and maintain constant throttle opening during shifts. It is very important not to move the accelerator pedal during the transaxle upshifts.

Step 3: Accelerate vehicle with throttle opening angle in range of 10 to 50 degrees. Operate vehicle until transaxle performs 1-2, 2-3, and 3-4 upshifts at least 15-20 times. Accelerating vehicle from stop to approx. 45mph moderate throttle angle (20-25 degrees) is sufficient.

Step 4: To set transaxle kickdown learn procedure, operate vehicle with speed less than 25mph, making 5-8 wide-open throttle kickdowns to 1st gear from either 2nd or 3rd gear. Make sure to allow transaxle to operate in 2nd or 3rd gear at least 5 seconds before performing kickdown.

Step 5: With vehicle speed greater than 25mph, make 5-8 part throttle to wide-open throttle kickdowns to either 3rd or 2nd gear from 4th gear (for example 4-3 or 4-2 kickdowns). Operate transaxle in 4th gear for at least 5 seconds at steady throttle position before performing kickdown.

Moveras Part Numbers Affected: